Soybean cultivar 9431836328643

ABSTRACT

A novel soybean cultivar, designated 9431836328643, is disclosed. The invention relates to the seeds of soybean cultivar 9431836328643, to the plants of soybean 9431836328643 and to methods for producing a soybean plant produced by crossing the cultivar 9431836328643 with itself or another soybean variety. The invention further relates to hybrid soybean seeds and plants produced by crossing the cultivar 9431836328643 with another soybean cultivar.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinctive soybean cultivar,designated 9431836328643. There are numerous steps in the development ofany novel, desirable plant germplasm. Plant breeding begins with theanalysis and definition of problems and weaknesses of the currentgermplasm, the establishment of program goals, and the definition ofspecific breeding objectives. The next step is selection of germplasmthat possess the traits to meet the program goals. The goal is tocombine in a single variety an improved combination of desirable traitsfrom the parental germplasm. These important traits may include higherseed yield, resistance to diseases and insects, better stems and roots,tolerance to drought and heat, and better agronomic quality.

Choice of breeding or selection methods depends on the mode of plantreproduction, the heritability of the trait(s) being improved, and thetype of cultivar used commercially (e.g., F₁ hybrid cultivar, purelinecultivar, etc.). For highly heritable traits, a choice of superiorindividual plants evaluated at a single location will be effective,whereas for traits with low heritability, selection should be based onmean values obtained from replicated evaluations of families of relatedplants. Popular selection methods commonly include pedigree selection,modified pedigree selection, mass selection, and recurrent selection.

The complexity of inheritance influences choice of the breeding method.Backcross breeding is used to transfer one or a few favorable genes fora highly heritable trait into a desirable cultivar. This approach hasbeen used extensively for breeding disease-resistant cultivars. Variousrecurrent selection techniques are used to improve quantitativelyinherited traits controlled by numerous genes. The use of recurrentselection in self-pollinating crops depends on the ease of pollination,the frequency of successful hybrids from each pollination, and thenumber of hybrid offspring from each successful cross.

Each breeding program should include a periodic, objective evaluation ofthe efficiency of the breeding procedure. Evaluation criteria varydepending on the goal and objectives, but should include gain fromselection per year based on comparisons to an appropriate standard,overall value of the advanced breeding lines, and number of successfulcultivars produced per unit of input (e.g., per year, per dollarexpended, etc.).

Promising advanced breeding lines are thoroughly tested and compared toappropriate standards in environments representative of the commercialtarget area(s) for three or more years. The best lines are candidatesfor new commercial cultivars; those still deficient in a few traits maybe used as parents to produce new populations for further selection.

These processes, which lead to the final step of marketing anddistribution, usually take from eight to 12 years from the time thefirst cross is made. Therefore, development of new cultivars is atime-consuming process that requires precise forward planning, efficientuse of resources, and a minimum of changes in direction.

A most difficult task is the identification of individuals that aregenetically superior, because for most traits the true genotypic valueis masked by other confounding plant traits or environmental factors.One method of identifying a superior plant is to observe its performancerelative to other experimental plants and to a widely grown standardcultivar. If a single observation is inconclusive, replicatedobservations provide a better estimate of its genetic worth.

The goal of plant breeding is to develop new, unique and superiorsoybean cultivars and hybrids. The breeder initially selects and crossestwo or more parental lines, followed by repeated selfing and selection,producing many new genetic combinations. The breeder can theoreticallygenerate billions of different genetic combinations via crossing,selfing and mutations. The breeder has no direct control at the cellularlevel. Therefore, two breeders will never develop the same line, or evenvery similar lines, having the same soybean traits.

Each year, the plant breeder selects the germplasm to advance to thenext generation. This germplasm is grown under unique and differentgeographical, climatic and soil conditions, and further selections arethen made, during and at the end of the growing season. The cultivarswhich are developed are unpredictable. This unpredictability is becausethe breeder's selection occurs in unique environments, with no controlat the DNA level (using conventional breeding procedures), and withmillions of different possible genetic combinations being generated. Abreeder of ordinary skill in the art cannot predict the final resultinglines he develops, except possibly in a very gross and general fashion.The same breeder cannot produce the same cultivar twice by using theexact same original parents and the same selection techniques. Thisunpredictability results in the expenditure of large amounts of researchmonies to develop superior new soybean cultivars.

The development of new soybean cultivars requires the development andselection of soybean varieties, the crossing of these varieties andselection of superior hybrid crosses. The hybrid seed is produced bymanual crosses between selected male-fertile parents or by using malesterility systems. These hybrids are selected for certain single genetraits such as pod color, flower color, pubescence color or herbicideresistance which indicate that the seed is truly a hybrid. Additionaldata on parental lines, as well as the phenotype of the hybrid,influence the breeder's decision whether to continue with the specifichybrid cross.

Pedigree breeding and recurrent selection breeding methods are used todevelop cultivars from breeding populations. Breeding programs combinedesirable traits from two or more cultivars or various broad-basedsources into breeding pools from which cultivars are developed byselfing and selection of desired phenotypes. The new cultivars areevaluated to determine which have commercial potential.

Pedigree breeding is used commonly for the improvement ofself-pollinating crops. Two parents which possess favorable,complementary traits are crossed to produce an F₁. An F₂ population isproduced by selfing one or several F₁'s. Selection of the bestindividuals may begin in the F₂ population; then, beginning in the F₃,the best individuals in the best families are selected. Replicatedtesting of families can begin in the F₄ generation to improve theeffectiveness of selection for traits with low heritability. At anadvanced stage of inbreeding (i.e., F₆ and F₇), the best lines ormixtures of phenotypically similar lines are tested for potentialrelease as new cultivars.

Mass and recurrent selections can be used to improve populations ofeither self- or cross-pollinating crops. A genetically variablepopulation of heterozygous individuals is either identified or createdby intercrossing several different parents. The best plants are selectedbased on individual superiority, outstanding progeny, or excellentcombining ability. The selected plants are intercrossed to produce a newpopulation in which further cycles of selection are continued.

Backcross breeding has been used to transfer genes for a simplyinherited, highly heritable trait into a desirable homozygous cultivaror inbred line which is the recurrent parent. The source of the trait tobe transferred is called the donor parent. The resulting plant isexpected to have the attributes of the recurrent parent (e.g., cultivar)and the desirable trait transferred from the donor parent. After theinitial cross, individuals possessing the phenotype of the donor parentare selected and repeatedly crossed (backcrossed) to the recurrentparent. The resulting plant is expected to have the attributes of therecurrent parent (e.g., cultivar) and the desirable trait transferredfrom the donor parent.

The single-seed descent procedure in the strict sense refers to plantinga segregating population, harvesting a sample of one seed per plant, andusing the one-seed sample to plant the next generation. When thepopulation has been advanced from the F₂ to the desired level ofinbreeding, the plants from which lines are derived will each trace todifferent F₂ individuals. The number of plants in a population declineseach generation due to failure of some seeds to germinate or some plantsto produce at least one seed. As a result, not all of the F₂ plantsoriginally sampled in the population will be represented by a progenywhen generation advance is completed.

In a multiple-seed procedure, soybean breeders commonly harvest one ormore pods from each plant in a population and thresh them together toform a bulk. Part of the bulk is used to plant the next generation andpart is put in reserve. The procedure has been referred to as modifiedsingle-seed descent or the pod-bulk technique.

The multiple-seed procedure has been used to save labor at harvest. Itis considerably faster to thresh pods with a machine than to remove oneseed from each by hand for the single-seed procedure. The multiple-seedprocedure also makes it possible to plant the same number of seeds of apopulation each generation of inbreeding. Enough seeds are harvested tomake up for those plants that did not germinate or produce seed.

Descriptions of other breeding methods that are commonly used fordifferent traits and crops can be found in one of several referencebooks (e.g., Allard, 1960; Simmonds, 1979; Sneep et al., 1979; Fehr,1987).

Proper testing should detect any major faults and establish the level ofsuperiority or improvement over current cultivars. In addition toshowing superior performance, there must be a demand for a new cultivarthat is compatible with industry standards or which creates a newmarket. The introduction of a new cultivar will incur additional coststo the seed producer, the grower, processor and consumer; for specialadvertising and marketing, altered seed and commercial productionpractices, and new product utilization. The testing preceding release ofa new cultivar should take into consideration research and developmentcosts as well as technical superiority of the final cultivar. Forseed-propagated cultivars, it must be feasible to produce seed easilyand economically.

Soybean, Glycine max (L), is an important and valuable field crop. Thus,a continuing goal of plant breeders is to develop stable, high yieldingsoybean cultivars that are agronomically sound. The reasons for thisgoal are obviously to maximize the amount of grain produced on the landused and to supply food for both animals and humans. To accomplish thisgoal, the soybean breeder must select and develop soybean plants thathave the traits that result in superior cultivars.

SUMMARY OF THE INVENTION

According to the invention, there is provided a novel soybean cultivar,designated 9431836328643. This invention thus relates to the seeds ofsoybean cultivar 9431836328643, to the plants of soybean 9431836328643and to methods for producing a soybean plant produced by crossing thesoybean 9431836328643 with itself or another soybean line.

Thus, any such methods using the soybean variety 9431836328643 are partof this invention: selfing, backcrosses, hybrid production, crosses topopulations, and the like. All plants produced using soybean variety9431836328643 as a parent are within the scope of this invention.Advantageously, the soybean variety could be used in crosses with other,different, soybean plants to produce first generation (F₁) soybeanhybrid seeds and plants with superior characteristics.

In another aspect, the present invention provides for single geneconverted plants of 9431836328643. The single transferred gene maypreferably be a dominant or recessive allele. Preferably, the singletransferred gene will confer such traits as herbicide resistance, insectresistance, resistance for bacterial, fungal, or viral disease, malefertility, male sterility, enhanced nutritional quality, and industrialusage. The single gene may be a naturally occurring soybean gene or atransgene introduced through genetic engineering techniques.

In another aspect, the present invention provides regenerable cells foruse in tissue culture of soybean plant 9431836328643. The tissue culturewill preferably be capable of regenerating plants having thephysiological and morphological characteristics of the foregoing soybeanplant, and of regenerating plants having substantially the same genotypeas the foregoing soybean plant. Preferably, the regenerable cells insuch tissue cultures will be embryos, protoplasts, meristematic cells,callus, pollen, leaves, anthers, roots, root tips, flowers, seeds, podsor stems. Still further, the present invention provides soybean plantsregenerated from the tissue cultures of the invention.

DEFINITIONS

In the description and tables which follow, a number of terms are used.In order to provide a clear and consistent understanding of thespecification and claims, including the scope to be given such terms,the following definitions are provided:

Maturity Date. Plants are considered mature when 95% of the pods havereached their mature color. The number of days are either calculatedfrom September 1 or from the planting date.

Seed Yield (Bushels/Acre). The yield in bushels/acre is the actual yieldof the grain at harvest.

Lodging Resistance. Lodging is rated on a scale of 1 to 5. A score of 1indicates erect plants. A score of 2.5 indicates plants are leaning at a45° angle in relation to the ground and a score of 5 indicates plantsare laying on the ground.

Phytophthora Tolerance. Tolerance to Phytophthora root rot is rated on ascale of 1 to 5, with a score of 1 being the best or highest toleranceranging down to a score of 5 which indicates the plants have notolerance to Phytophthora.

Emergence. This score indicates the ability of the seed to emerge whenplanted 3″ deep in sand and with a controlled temperature of 25° C. Thenumber of plants that emerge each day are counted. Based on this data,each genotype is given a 1 to 5 score based on its rate of emergence andpercent of emergence. A score of 1 indicates an excellent rate andpercent of emergence, an intermediate score of 2.5 indicates averageratings and a 5 score indicates a very poor rate and percent ofemergence.

Iron-Deficiency Chlorosis. Plants are scored 1 to 5 based on visualobservations. A score of 1 means no stunting of the plants or yellowingof the leaves and a score of 5 indicates the plants are dead or dyingcaused by iron-deficiency chlorosis, a score of 2.5 means plants haveintermediate health with some leaf yellowing.

Brown Stem Rot. This is a visual disease score from 1 to 5 comparing allgenotypes in a given test. The score is based on leaf symptoms ofyellowing and necrosis caused by brown stem rot. A score of 1 indicatesno symptoms. Visual scores range to a score of 5 which indicates severesymptoms of leaf yellowing and necrosis.

Shattering. The amount of pod dehiscence prior to harvest. Poddehiscence involves seeds falling from the pods to the soil. This is avisual score from 1 to 5 comparing all genotypes within a given test. Ascore of 1 means pods have not opened and no seeds have fallen out. Ascore of 2.5 indicates approximately 50% of the pods have opened, withseeds falling to the ground and a score of 5 indicates 100% of the podsare opened.

Plant Height. Plant height is taken from the top of soil to top node ofthe plant and is measured in inches.

Seed Protein Peroxidase Activity. Seed protein peroxidase activity isdefined as a chemical taxonomic technique to separate cultivars based onthe presence or absence of the peroxidase enzyme in the seed coat. Thereare two types of soybean cultivars, those having high peroxidaseactivity (dark red color) and those having low peroxidase activity (nocolor).

Allele. Allele is any of one or more alternative forms of a gene, all ofwhich alleles relate to one trait or characteristic. In a diploid cellor organism, the two alleles of a given gene occupy corresponding locion a pair of homologous chromosomes.

Backcrossing. Backcrossing is a process in which a breeder repeatedlycrosses hybrid progeny back to one of the parents, for example, a firstgeneration hybrid F₁ with one of the parental genotypes of the F₁hybrid.

Essentially all the physiological and morphological characteristics. Aplant having essentially all the physiological and morphologicalcharacteristics means a plant having the physiological and morphologicalcharacteristics, except for the characteristics derived from theconverted gene.

Quantitative Trait Loci (QTL). Quantitative trait loci (QTL) refer togenetic loci that control to some degree numerically representabletraits that are usually continuously distributed.

Regeneration. Regeneration refers to the development of a plant fromtissue culture.

Single Gene Converted (Conversion). Single gene converted (conversion)plant refers to plants which are developed by a plant breeding techniquecalled backcrossing wherein essentially all of the desired morphologicaland physiological characteristics of a variety are recovered in additionto the single gene transferred into the variety via the backcrossingtechnique or via genetic engineering.

DETAILED DESCRIPTION OF THE INVENTION

Soybean cultivar 9431836328643 has superior characteristics and wasdeveloped from the cross A3134/3/A3313//A3237*4/40-3-2. F₁ and F₂ plantswere advanced by a modified pedigree selection. F₃ derived F₄ plantswere grown in Chile in 1996 where plants were selected. In 1996 F₃derived F₅ plants were tested at 4 Midwest locations. In 1997 and 1998the line was tested at 10 and 26 Midwest locations respectively.

9431836328643 is an early maturity group III variety with very highyield potential to lines of similar maturity and has excellent agronomiccharacteristics, including lodging resistance. 9431836328643 isresistant to the Roundup™ herbicides and has a major gene forPhytophthora resistance, Rps1 k, conferring resistance to most races ofPhytophthora Root Rot. 9431836328643 is well adapted to the mid maturitygroup III growing areas of Iowa, Illinois, Missouri, Indiana, Nebraskaand Kansas.

Some of the criteria used to select in various generations include: seedyield, lodging resistance, emergence, disease tolerance, maturity, lateseason plant intactness, plant height and shattering resistance.

The cultivar has shown uniformity and stability, as described in thefollowing variety description information. It has been self-pollinated asufficient number of generations with careful attention to uniformity ofplant type. The line has been increased with continued observation foruniformity.

Soybean cultivar 9431836328643 has the following morphologic and othercharacteristics (based primarily on data collected at Stonington, Ill.).

VARIETY DESCRIPTION INFORMATION

1. Seed Shape: Spherical Flattened (L/W ratio>1.2; L/T ratio=<1.2)

2. Hilum Color: (Mature Seed)—Imperfect Black

3. Pod color: Brown

4. Seed Coat Color: Yellow

5. Flower Color: Purple

6. Leaflet Shape: Ovate

7. Leaflet Size: Medium

8. Leaf Color: Medium-green

9. Plant Pubescence Color: Grey

10. Plant Habit: Indeterminate

11. Maturity Group: III

12. Plant Lodging Score: 1.8

13. Plant Height: 39 inches

14. Physiological Responses:

Roundup Ready™ Herbicide: Resistant

15. Disease Resistance:

Phytophthora Rot (Phytophthora megasperma var. sojae):

Race 1 Resistant

Race 2 Resistant

Race 3 Resistant

Race 4 Resistant

Race 5 Resistant

Race 6 Resistant

Race 7 Resistant

Race 8 Resistant

Race 9 Resistant

Race 10 Resistant

Race 11 Resistant

Race 13 Resistant

Race 14 Resistant

Race 15 Resistant

Race 17 Resistant

Race 18 Resistant

Race 22 Resistant

Race 24 Resistant

This invention is also directed to methods for producing a soybean plantby crossing a first parent soybean plant with a second parent soybeanplant, wherein the first or second soybean plant is the soybean plantfrom the line 9431836328643. Further, both first and second parentsoybean plants may be from the cultivar 9431836328643. Therefore, anymethods using the cultivar 9431836328643 are part of this invention:selfing, backcrosses, hybrid breeding, and crosses to populations. Anyplants produced using cultivar 9431836328643 as a parent are within thescope of this invention.

As used herein, the term “plant” includes plant cells, plantprotoplasts, plant cells of tissue culture from which soybean plants canbe regenerated, plant calli, plant clumps, and plant cells that areintact in plants or parts of plants, such as pollen, flowers, embryos,ovules, seeds, pods, leaves, stems, roots, anthers and the like. Thus,another aspect of this invention is to provide for cells which upongrowth and differentiation produce a cultivar having essentially all ofthe physiological and morphological characteristics of 9431836328643.

Culture for expressing desired structural genes and cultured cells areknown in the art. Also as known in the art, soybeans are transformableand regenerable such that whole plants containing and expressing desiredgenes under regulatory control may be obtained. General descriptions ofplant expression vectors and reporter genes and transformation protocolscan be found in Gruber, et al., “Vectors for Plant Transformation, inMethods in Plant Molecular Biology & Biotechnology” in Glich, et al.,(Eds. pp. 89-119, CRC Press, 1993). Moreover GUS expression vectors andGUS gene cassettes are available from Clone Tech Laboratories, Inc.,Palo Alto, Calif. while luciferase expression vectors and luciferasegene cassettes are available from Pro Mega Corp. (Madison, Wis.).General methods of culturing plant tissues are provided for example byMaki, et al., “Procedures for Introducing Foreign DNA into Plants” inMethods in Plant Molecular Biology & Biotechnology, Glich, et al., (Eds.pp. 67-88 CRC Press, 1993); and by Phillips, et al., “Cell-TissueCulture and In-Vitro Manipulation” in Corn & Corn Improvement, 3rdEdition; Sprague, et al., (Eds. pp. 345-387) American Society ofAgronomy Inc., 1988. Methods of introducing expression vectors intoplant tissue include the direct infection or co-cultivation of plantcells with Agrobacterium tumefaciens, Horsch et al., Science, 227:1229(1985). Descriptions of Agrobacterium vectors systems and methods forAgrobacterium-mediated gene transfer provided by Gruber, et al., supra.

Useful methods include but are not limited to expression vectorsintroduced into plant tissues using a direct gene transfer method suchas microprojectile-mediated delivery, DNA injection, electroporation andthe like. More preferably expression vectors are introduced into planttissues using the microprojectile media delivery with the biolisticdevice Agrobacterium-medicated transformation. Transformant plantsobtained with the protoplasm of the invention are intended to be withinthe scope of this invention.

The present invention contemplates a soybean plant regenerated from atissue culture of a variety (e.g., 9431836328643) or hybrid plant of thepresent invention. As is well known in the art, tissue culture ofsoybean can be used for the in vitro regeneration of a soybean plant.Tissue culture of various tissues of soybeans and regeneration of plantstherefrom is well known and widely published. For example, reference maybe had to Komatsuda, T., et al., “Genotype X Sucrose Interactions forSomatic Embryogenesis in Soybean,” Crop Sci. 31:333-337 (1991);Stephens, P. A., et al., “Agronomic Evaluation of Tissue-Culture-DerivedSoybean Plants,” Theor. Appl. Genet. (1991) 82:633-635; Komatsuda, T.,et al., “Maturation and Germination of Somatic Embryos as Affected bySucrose and Plant Growth Regulators in Soybeans Glycine gracilis Skvortzand Glycine max (L.) Merr.,” Plant Cell, Tissue and Organ Culture,28:103-113 (1992); Dhir, S., et al., “Regeneration of Fertile Plantsfrom Protoplasts of Soybean (Glycine max L. Merr.): GenotypicDifferences in Culture Response,” Plant Cell Reports (1992) 11:285-289;Pandey, P. et al., “Plant Regeneration from Leaf and Hypocotyl Explantsof Glycine wightii (W. And A.) VERDC. var longicauda,” Japan J. Breed.42:1-5 (1992); and Shetty, K., et al., “Stimulation of In Vitro ShootOrganogenesis in Glycine max (Merrill.) by Allantoin and Amides,” PlantScience (1992) 81:245-251; as well as U.S. Pat. No. 5,024,944, issuedJun. 18,1991 to Collins, et al., and U.S. Pat. No. 5,008,200, issuedApr. 16, 1991 to Rauch, et al., the disclosures of which are herebyincorporated herein in their entirety by reference. Thus, another aspectof this invention is to provide cells which upon growth anddifferentiation produce soybean plants having the physiological andmorphological characteristics of variety 9431836328643.

The cultivar 9431836328643 is similar to AG3301. While similar toAG3301, there are numerous differences including: 9431836328643 yieldsapproximately 4 bushels/acre more than AG3301. Additionally,9431836328643 matures approximately 3 days earlier than AG3301. Also,9431836328643 has the Rps¹k gene for Phytophthora Root Rot while AG3301carries the Rps¹c gene.

TABLES

In Tables 1, 2 and 3 that follow, the traits and characteristics ofsoybean cultivar 9431836328643 are compared to several competingvarieties of commercial soybeans of similar maturity. In the tables,column 1 shows the yield in bushels/acre for the instant invention andthe Competitor Variety. Column 2 indicates the days to maturity afterSeptember 1 for the instant invention and the Competitor Variety. Column3 shows the plant height in inches for the instant invention and theCompetitor Variety. Column 4 indicates the plant lodging for the instantinvention and the Competitor Variety. Column 5 shows the generalappearance rating scores for the instant invention and the CompetitorVariety. Lodging and General Appearance Rating scores are rated 1=Bestand 5=Worst.

TABLE I 1996 AGRONOMIC DATA BU/A MAT HGT LDG GR Overall Mean 55.95 33.0034.10 1.60 2.10 Number of Locations 4 4 4 4 4 9431836328643 61.00 32.8033.50 2.00 2.50 Asgrow A3244 65.32 33.00 33.30 1.10 1.00 Asgrow A313460.86 33.80 32.80 1.50 2.00 Asgrow AG2901 59.85 31.00 38.80 1.80 2.00Asgrow A2722 49.74 31.00 31.30 1.10 2.00

TABLE 2 1997 AGRONOMIC DATA BU/A MAT HGT LDG GR Overall Mean 56.30 27.8034.50 1.40 2.00 Number of Locations 10 10 10 9 10 LSD 2.64 0.88 1.410.17 0.35 9431836328643 59.45 26.20 34.50 1.60 2.40 Asgrow A3244 59.8526.40 33.00 1.10 1.50 Asgrow A3559 59.66 30.10 34.70 1.20 1.90 AsgrowAG3002 56.80 25.00 33.70 1.80 2.50 Asgrow A2833 56.13 21.90 29.00 1.002.30 Asgrow AG3301 56.07 26.40 36.80 1.70 2.30

TABLE 3 1998 AGRONOMIC DATA BU/A MAT HGT LDG GR Overall Mean 61.76 21.5037.10 1.70 2.50 Number of Locations 26 24 24 25 24 LSD 1.37 0.50 0.730.11 0.17 9431836328643 64.63 20.20 38.50 1.80 2.80 Asgrow AG3302 65.6021.20 37.90 1.70 2.00 BR65950RR 63.49 21.90 37.80 2.00 2.50 AsgrowAG3002 63.00 18.80 35.20 2.10 3.10 Pioneer 93B51 62.57 21.80 36.10 1.602.70 Asgrow AG3303 62.37 22.10 38.00 1.20 2.10 pgR3083 62.16 18.40 34.601.50 2.50 Pioneer 9333 61.98 19.70 34.80 1.80 2.90 Asgrow AG3301 61.7121.50 39.80 1.90 2.60 Pioneer 93B01 61.58 16.00 32.00 1.30 2.50 AsgrowAG2902 60.99 17.50 35.60 1.50 2.20 Asgrow AG3502 60.89 25.00 40.10 1.502.00 Pioneer 9344 60.40 20.70 36.80 1.70 2.70 NK S30-K3RR 60.26 17.8037.60 1.80 2.90 NK S36-U2RR 58.71 22.50 37.20 1.70 2.80 Stine 3264 58.4521.90 37.40 1.70 2.90 Stine 3514 57.95 18.90 36.80 1.80 3.30 DekalbCX370RR 56.69 23.00 40.20 2.40 3.30

In Table 4 that follows, the traits and characteristics of soybeancultivar 9431836328643 are compared to several competing varieties ofcommercial soybeans of similar maturity. Each characteristic alsoindicates the number of locations which comprise the figures given. Inthese tables, column 1 shows the Competitor Variety. In columns 2, 3, 4and 5 show the number of sites, the yield in bushels/acre for theinstant invention, the Competitor Variety identified in column 1 and thedifference, respectively. Columns 6, 7 and 8 indicate the sites testedfor days to maturity after August 31, for the instant invention andCompetitor Variety, respectively. Columns 9, 10 and 11 show the numberof sites tested for plant height in inches for the instant invention andthe Competitor Variety respectively. Columns 12, 13 and 14 show thesites tested for plant lodging scores of the instant invention andCompetitor Variety. Columns 15, 16 and 17 show the general rating scoresfor the instant invention and the Competitor Variety, respectively.Lodging and General Rating scores are rated 1=Best and 5=Worst.

TABLE 4 Check Other Check Other Check Other Yield Yield MaturityMaturity PltHt PltHt Other Variety or Hybrid Sites Bu/A Bu/A DiffSites >8/31 >8/31 Sites In In Asgrow AG2902 39 61.4 58.5 2.9 32 1.8 1.535 21.4 21.0 Asgrow AG3002 39 61.4 58.9 2.5 32 1.8 2.1 35 21.4 22.4Asgrow AG3301 39 61.4 57.6 3.7 32 1.8 1.9 35 21.4 24.6 Asgrow AG3302 3961.4 61.8 −0.4  32 1.8 1.7 35 21.4 26.9 Asgrow AG3502 39 61.4 58.6 2.832 1.8 1.7 35 21.4 29.7 Dekalb CX370RR 35 62.2 54.9 7.3 28 1.9 2.4 3120.8 24.3 Novartis S30-K3RR 35 62.2 57.5 4.8 28 1.9 1.9 31 20.8 18.6Novartis S36-U2RR 35 62.2 57.0 5.2 28 1.9 1.8 31 20.8 23.9 AsgrowAGC33801 34 61.1 59.7 1.4 28 1.9 1.3 30 20.6 23.1 Asgrow FPG2975 36 61.760.2 1.5 30 1.9 1.4 32 21.2 22.7 Pioneer 93B01 30 63.0 58.8 4.2 25 1.91.4 26 19.9 15.9 Pioneer 93B51 30 63.0 60.1 2.9 25 1.9 1.7 26 19.9 21.7Pioneer 9344 30 63.0 58.0 5.0 25 1.9 1.8 26 19.9 20.4 Pioneer 9333 3961.4 58.0 3.4 32 1.8 1.7 35 21.4 20.8 Stine 3264 39 61.4 56.1 5.3 32 1.81.7 35 21.4 24.2 Stine 3514 30 63.0 56.1 6.9 25 1.9 2.0 26 19.9 18.6Check Other Check Other Lodge Lodge GRat2 GRat2 Other Variety or HybridSites (1-5) (1-5) Sites (1-5) (1-5) Asgrow AG2902 35 37.4 35.8 AsgrowAG3002 35 37.4 34.2 Asgrow AG3301 35 37.4 38.9 Asgrow AG3302 35 37.436.6 Asgrow AG3502 35 37.4 38.8 Dekalb CX370RR 31 37.8 39.0 NovartisS30-K3RR 31 37.8 36.4 Novartis S36-U2RR 31 37.8 36.4 Asgrow AGC33801 3037.9 37.5 Asgrow FPG2975 32 37.8 34.1 Pioneer 93B01 26 38.4 31.4 Pioneer93B51 26 38.4 35.5 Pioneer 9344 26 38.4 36.3 Pioneer 9333 35 37.4 33.4Stine 3264 35 37.4 36.0 Stine 3514 26 38.4 36.3

When the term soybean plant is used in the context of the presentinvention, this also includes any single gene conversions of thatvariety. The term single gene converted plant as used herein refers tothose soybean plants which are developed by a plant breeding techniquecalled backcrossing wherein essentially all of the desired morphologicaland physiological characteristics of a variety are recovered in additionto the single gene transferred into the variety via the backcrossingtechnique. Backcrossing methods can be used with the present inventionto improve or introduce a characteristic into the variety. The termbackcrossing as used herein refers to the repeated crossing of a hybridprogeny back to the recurrent parent. The parental soybean plant whichcontributes the gene for the desired characteristic is termed thenonrecurrent or donor parent. This terminology refers to the fact thatthe nonrecurrent parent is used one time in the backcross protocol andtherefore does not recur. The parental soybean plant to which the geneor genes from the nonrecurrent parent are transferred is known as therecurrent parent as it is used for several rounds in the backcrossingprotocol (Poehlman & Sleper, 1994; Fehr, 1987). In a typical backcrossprotocol, the original variety of interest (recurrent parent) is crossedto a second variety (nonrecurrent parent) that carries the single geneof interest to be transferred. The resulting progeny from this cross arethen crossed again to the recurrent parent and the process is repeateduntil a soybean plant is obtained wherein essentially all of the desiredmorphological and physiological characteristics of the recurrent parentare recovered in the converted plant, in addition to the singletransferred gene from the nonrecurrent parent.

The selection of a suitable recurrent parent is an important step for asuccessful backcrossing procedure. The goal of a backcross protocol isto alter or substitute a single trait or characteristic in the originalvariety. To accomplish this, a single gene of the recurrent variety ismodified or substituted with the desired gene from the nonrecurrentparent, while retaining essentially all of the rest of the desiredgenetic, and therefore the desired physiological and morphological,constitution of the original variety. The choice of the particularnonrecurrent parent will depend on the purpose of the backcross, one ofthe major purposes is to add some commercially desirable, agronomicallyimportant trait to the plant. The exact backcrossing protocol willdepend on the characteristic or trait being altered to determine anappropriate testing protocol. Although backcrossing methods aresimplified when the characteristic being transferred is a dominantallele, a recessive allele may also be transferred. In this instance itmay be necessary to introduce a test of the progeny to determine if thedesired characteristic has been successfully transferred.

Many single gene traits have been identified that are not regularlyselected for in the development of a new variety but that can beimproved by backcrossing techniques. Single gene traits may or may notbe transgenic, examples of these traits include but are not limited to,male sterility, waxy starch, herbicide resistance, resistance forbacterial, fungal, or viral disease, insect resistance, male fertility,enhanced nutritional quality, industrial usage, yield stability andyield enhancement. These genes are generally inherited through thenucleus. Several of these single gene traits are described in U.S. Pat.Nos. 5,959,185, 5,973,234 and 5,977,445, the disclosures of which arespecifically hereby incorporated by reference.

A further aspect of the invention relates to tissue culture of soybeanplants designated 9431836328643. As used herein, the term “tissueculture” indicates a composition comprising isolated cells of the sameor a different type or a collection of such cells organized into partsof a plant. Exemplary types of tissue cultures are protoplasts, calli,plant clumps, and plant cells that can generate tissue culture that areintact in plants or parts of plants, such as embryos, pollen, flowers,seeds, pods, leaves, stems, roots, root tips, anthers, and the like.Means for preparing and maintaining plant tissue culture are well knownin the art. By way of example, a tissue culture comprising organs hasbeen used to produce regenerated plants. (See U.S. Pat. Nos. 5,959,185;5,973,234 and 5,977,445, the disclosures of which are incorporatedherein by reference).

DEPOSIT INFORMATION

A deposit of the Asgrow Seed Company, LLC proprietary soybean cultivar9431836328643 disclosed above and recited in the appended claims hasbeen made with the American Type Culture Collection (ATCC), 10801University Boulevard, Manassas, Va. 20110. The date of deposit was Aug.3, 2001. The deposit of 2,500 seeds were taken from the same depositmaintained by Asgrow Seed Company, LLC since prior to the filing date ofthis application. All restrictions upon the deposit have been removed,and the deposit is intended to meet all of the requirments of 37 C.F.R.§1.801-1.809. The ATCC accession number is PTA-3597. The deposit will bemaintained in the depository for a period of 30 years, or 5 years afterthe last request, or for the effective life of the patent, whichever islonger, and will be replaced as necessary during that period.

Although the foregoing invention has been described in some detail byway of illustration and example for purposes of clarity andunderstanding, it will be obvious that certain changes and modificationsmay be practiced within the scope of the invention, as limited only bythe scope of the appended claims.

What is claimed is:
 1. A soybean seed designated 9431836328643, a sampleof said seed deposited under ATCC Accession No. PTA-3597.
 2. A soybeanplant, or parts thereof, produced by growing the seed of claim
 1. 3.Pollen of the plant of claim
 2. 4. An ovule of the plant of claim
 2. 5.A soybean plant, or parts thereof, having all of the physiological andmorphological characteristics of the soybean plant of claim
 2. 6. Atissue culture of regenerable cells of a soybean plant of cultivar9431836328643, wherein the tissue culture regenerates plants having allof the morphological and physiological characteristics of the soybeanplant of claim
 2. 7. The tissue culture according to claim 6, the cellsbeing derived from a member of the group consisting of leaves, pollen,embryos, meristematic cells, roots, root tips, anthers, flowers, seeds,stems and pods.
 8. A soybean plant regenerated from the tissue cultureof claim 6, having all of the morphological and physiologicalcharacteristics of the soybean plant of claim
 2. 9. A method forproducing a soybean seed comprising crossing a first parent soybeanplant with a second parent soybean plant and harvesting the resultanthybrid soybean seed, wherein said first parent soybean plant or saidsecond parent soybean plant is the soybean plant of claim
 2. 10. Ahybrid soybean seed produced by the method of claim
 9. 11. A hybridsoybean plant, or parts thereof, produced by growing said hybrid soybeanseed of claim
 10. 12. Soybean seed produced from said hybrid soybeanplant of claim
 11. 13. A method for producing a hybrid soybean seedcomprising crossing the soybean plant according to claim 2 with another,different soybean plant.
 14. A hybrid soybean seed produced by themethod of claim
 13. 15. A hybrid soybean plant, or parts thereof,produced by growing said hybrid soybean seed of claim
 14. 16. Soybeanseed produced from said hybrid soybean plant of claim
 15. 17. A methodfor producing a 9431836328643-derived soybean plant, comprising: a)crossing a soybean plant of soybean line 9431836328643, a sample of seedof said line having been deposited under ATCC accession number PTA-3597,with a second soybean plant to yield progeny soybean seed; b) growingprogeny soybean seed to yield said 9431836328643-derived soybean plant.18. A soybean plant, or parts thereof, derived from the soybean plant,or parts thereof, of claim 2 by transformation with genetic materialcontaining one or more transgenes operably linked to one or moreregulatory elements.
 19. A method for producing a soybean plant thatcontains in its genetic material one or more transgenes, comprisingcrossing the soybean plant of claim 18 with either a second plant ofanother soybean line, or a non-transformed soybean plant of the line9431836328643 (ATCC Accession No. PTA-3597), so that the geneticmaterial of the progeny that result from the cross contains thetransgene(s) operably linked to a regulatory element.
 20. A soybeanplant produced by the method of claim
 19. 21. A soybean plant derivedfrom the plant of claim 5 by a single gene conversion.
 22. The soybeanplant of claim 21, wherein the gene is selected from the groupconsisting of: a transgene, a dominant gene, and a recessive gene. 23.The soybean plant of claim 21, wherein the gene confers a characteristicselected from the group consisting of: herbicide resistance, insectresistance, resistance to bacterial, fungal, or viral disease, malesterility, and improved nutritional quality.